Multiple variable condenser



June 21? 1927. w. M BROWER 633,516

MULTIPLE VARIABLE CONDENSER Filed Jan. 17, 1927 2 Sheets-Sheet 1INVENTOR.

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ATTORNEY June 21, 1927. BROWER IULTIPLE VARIABLE CONDENSER Filed Jan.17, 1927 2 Sheets-Shbet 2 INVENTOR. :66am 9T6. @wwa/v,

d ATTORNEY Patented June 21, 1927.

1,633,516 UNITED-STATES PATENT OFFICE.

WHQIHM II. BROWER, F PALO ALTO, CALIFORNIA, ASSIGNOR TO FEDERAL TELEGRAPH comrAnY, or sax rem FRANCISCO, oamrom'qm, A CORPORATION or CALLMULTIPLE VARIABLE connnnsaa.

Application died January 17, 1927. Serial No. 161,865.

My invention relates broadly to tuning apparatus and more particularlyto a system of variable condensers for contro mg the adjustment of aplurality of electrical c1r- 5 cults simultaneously. I

One of'the objects of myinventlon is to provide a" system ofv tuningcondensers wherein individual condensers are insulating- 1 supportedfrom a. chassis which forms an electrostatic shield for the several cndensers and provides a rigid support for the mounting of thecondensers.

Another object of my invention to provide a construction 'of multiplevariable 15 condenser mounted within a main chassis in which the statorplates of individual condenser units are insulatingl mounted on thepartition walls of a chassis, while the rotor plates are carried by ashaft journaled 1n the partition walls of the chassis for simultaneouslycontrolling the movement of the sets of rotor plates with respect to thesets of stator plates.

:1 A further object of my invention is to providea construction ofintegral housing for a plurality of independent condensers with meansfor insulatingly supporting independent setsof rotor plates in spacerelationship to the walls of the housing while the rotor plates aremounted for movement with respect tothe stator plates under control of acentral drum positioned within the condenser housing.

A still further object of my invention is to provide a construction ofmultiple variable condenser in which a chassis is arranged for housingindependent sets of variable condensers, where the sets are disposed inelectrostatically shielded portions of the chas- 40 'sis, and the statorplates mounted on insulation means connected with the walls of thechassis.

A still further object of my invention is to rovide a construction ofchassis for a mu ti' le variable condenser divided into a plura ity ofindividual portions each arranged for housing an individual variablecondenser with a rotatable shaft member extending through the chassisand provided 6 wit a rotatable drum operative within a central portionof the chassis for indicating the rotative movement of thelongitudinally extending condenser shaft.

My invention will be more clearly understood by reference to thefollowing specification and the accompanying drawings wherein:

Fig. 1 is a plan view with indicatin drum broken away cross=sect1on;i'g. 2 is a cross-sectional view taken through the chassis of thevariable condenser system of my invention; Fig. 3 1s a cross-sectionalview taken through the chassis on line a part of the plurality ofelectrostatically shielded casings in which individual units may bemounted. The partition walls are so formed that they provide bearingsfor a longitudinally extending shaft in the condenser chassis, whichshaft carries the sets of rotor plates for cooperation with the sets ofstator plates. The sets of stator plates are mounted on insulatedendmembers which are in turn mechanically connected with the end wallsof the chassis and with the partition walls. The particular method ofmounting the stator elements permits assembly of the apparatus on aquantity production basis by a process of moving the chassis intoposition with respect to the assembled stator and rotor lates where boltmembers may be passed through the insulated supporting means of each ofthe sets of stator plates and secured to the partition walls for rmlyanchoring the sets of stator plates into position.

Referring to the drawings in detail, reference character 1- representsthe condenser chassis or cradle havlng end portions 2 and 3 withinterconnected webs or partition walls 4, 5, 6 and 7 disposed laterallyalong the frame of the condenser. The partition walls formelectrostatically shielded enclosures for each of the sets of rotor andstator plates.

variable condenser 33 of Fig. 2 and Fig. 4 is i an end VleW'0f therotary indicating drum and shown in 'eaclr of which are through hu-bmember 30. The sets of rotor plates have been represented moreparticularly in Fig. 2 at 9, 18, 20 and 23. These rotor plates aresupported on carriers or hub Inemb'e'rS'17',"1 9, 21 and 221,respectively, keyed to the rotatable shaft *8 in a selected positionbymeans of a set screw. In'order to maintain the shaft 8 in 'a-selectfed"position' a stop member 31 is secured upon the shaft 8 adacent the parti- "tion wall 5 for locating the shaft with respect to thecondenser chassis. Adjacent each wall and attached to the shaft 8 Iprovide a spiral connecting member 32 which connects to a terminal 33carried by the chassis 1 and to which electrical connection can be madeto the electron tube system in which the multiple condenser is connectedthereby establishing a good electrical connection direct with each 'setof rotor plates. The sets of stator plates as shown at 24, 25, 26 and 27are located between the'w'alls comprising the several sections of thechassis by means of an assembly which includes screw members 34 whichform supporting posts for'the stator plates and insulation means 35 and36. The insulation means 35 and 36 are in the form of rectangular stripsapertured adjacent each corner thereof. Each set of stator plates has ascrew member 34 located at opposite ends thereof, and these screwmembers project through the apertures in insulated plates 35 and 36 andare secured therein by means of nuts 37. The insulated strips 35 and 36are mountedbetween the walls by means of bolt members 39 with insulatedbushings thereon. In the case of the condensersassembled on oppositesides of the walls 4 and 7 a bolt member passes through both strips ofinsulation and through each of the ins ulated bushings rigidly mountingthe insulation strip members in spacial rela tion to the condenserchassis. The assembly of the insulation strips upon the bolt members 38is such that the several sets of condensers may be moved into thechassis and the condensers rapidly bolted into place in spacial relationto the several walls of the chassis. The rotary indicating drum which isoperative in the portion 14 of the chassis is provided with a groovedpulley drum 40 around which drive cord 41 passes, the drive cordbeingdirected over guide pulley members -12, the movement of which iscontrolled other than are imposed by the scope of the appended claims.

W hat follows 1. A multiple variable condensercorripris- I claim as newand desire to secure by Letters Patent of the United 'Statesfis as ing achassis constituted by anintegralsubstantially rectangular housing, a-pl rality. I

of integral web members disposed i -said housing at points spacedalongsaid chassis providing compartments. electrostatically, I

isolated one from another, a variable condenser including stator androtor plates dis posed in each of said compartments, said statorrplatesbeing insulatingly suspended from the web members of said compartments,

a shaft member passing through said chassis.

and journaled in the walls of said compartments for carrying said setsofrotor, plates, whereby said sets of rotor lates may be variablyinterleaved with sai sets of stator plates. 2. A multiple variablecondenser'comprising a chassis constituted by an integral metallichousing having laterally extending web portions at spaced intervalsalong the,

length thereof and forming electrostatically L shielded compartments,variable condenser units located within said compartments, each of saidvariable condenser units having rotor and stator plates, said statorplates .be-

ing provided with insulated endportions errtending substantiallyparallel to the web portions of said compartments and connec= tionsbetween said insulated strip members and the walls of said compartments.

3. A multiple variable condenser com-- prising a chassis constituted bya substantially rectangular housing having laterally extending partitionwalls disposed at spaced intervals along the length thereof, andproviding compartments within said housing, a rotatable shaft memberpassing longitudinally through said chassis and journaled in said walls,variable condensers located in each of said compartments, saidcondensers being constituted by sets of rotor and stator plates, saidsets of stator plates each having posts extending on opposite sidesthereof, in-

sulating strip members mounted from said partition walls in planesparallel thereto, and connections between said insulating strip membersand said posts for suspending said stator plates in spaced relationwithin each of said compartments in a position in which said sets ofrotor plates carried by plates carried b each of said hub inembers, saidshaft may be variably interleaved theresets of stator p ates disposedbetween said 15 with. laterally extending portions in a position 4. Amultiple variable condenser combetween which'said rotor plates may bevaprising 'a chassis constituted by a housing riably interleaved, saidsets of stator plates having a plurality of integrally connected eachhaving strips of insulation extendin laterally extending portions atspaced interparallel to the surface of said plates, and vals along thelength thereof, a shaft memspacing members connected to said laterallyber passing longitudinally through said extending portions and to saidinsulation chassis and journaled in said laterally exstrips for locatingsaid sets of stator plates tending portions, a hub member secured tobetween said laterally extending portions. said shaft memberintermediate each of said In testimony whereof I aflix my signature.laterally extending portions, sets of rotor WILLIAM M. BROWER.

